SAN FRANCISCO — Apple showed off an upcoming update to its Mac Pro desktop line that will be made in the United States and introduced a new line of MacBook Air laptops that it promises will have all-day battery life on Monday.

During the keynote address of its Worldwide Developers Conference, Apple marketing chief Phil Schiller showed off a new Mac Pro that he called “a machine unlike anything we’ve ever made, both inside and out,” and said it would be completely designed and manufactured in the U.S. At an eighth of the volume of the previous Mac Pro, the new offering will double the performance with help from a new Intel Xeon chip.

Apple CEO Tim Cook said in an interview late last year that Apple would spend $100 million moving manufacturing of a specific Mac line to the U.S.; last month, Cook said the plant would be in Texas.

“The product will be assembled in Texas, include components made in Illinois and Florida, and rely on equipment produced in Kentucky and Michigan,” Cook said during a Senate hearing on Apple’s tax practices.

The new MacBook Air, which will be offered in 11-inch and 13-inch models, will nearly double the battery life of earlier Airs with Intel’s Haswell chipset; they will be available for purchase immediately, Schiller said.

The new PC and laptop offerings will run on operating systems named after familiar destinations for Californians: Apple announced that they will begin naming updates to its OS offerings after places in its home state. Software engineering leader Craig Federighi, taking the stage from CEO Tim Cook, announced an update for OS X, or Mountain Lion, dubbed “Mavericks,” after the San Mateo County surf spot that is home to a big-wave competition known the world over.

“We want to set a name that will carry us for at least the next ten years, and the answer was really obvious: It’s those places that inspire us here in California, the place where OS X is designed and built,” Federighi said.

Mavericks will focus on extending battery life for Apple’s PCs and laptops, Federighi said, along with increased responsiveness and new apps. New offerings Federighi showed off included updates for users who have multiple displays, the ability to tag documents, and browser-style tabs in the finder window, as well as access to some offerings that were previously only on mobile devices: Maps, app notifications and iBooks. The new version of Apple’s operating system will also include an updated Safari Web browser that Federighi said is more than twice as fast as Google’s Chrome while using less energy.

Before handing the stage over to Federighi, Cook celebrated Apple’s retail and digital stores.

“Our stores have become integral parts of the communities where they serve,” Cook — dressed in a black Oxford shirt and jeans — said of the Apple chain, which he revealed now has 407 stores in 14 countries. Cook also pointed out that Apple’s App Store will turn five years old next month and has paid out $10 billion to app developers, $5 billion just in the past year.

WWDC, Apple’s annual meeting with developers, is expected to also focus on a new operating system for the company’s popular mobile devices. Along with the seventh full iteration of iOS, reports have speculated that Apple will introduce an ad-supported streaming-radio service similar to Pandora’s offering and possibly a new edition of its standard operating system for non-mobile devices.

Before the keynote began Monday morning, thousands of congregants gathered at the Moscone West conference center at 4th and Howard streets in San Francisco for the keynote address, including Apple cofounder Steve Wozniak, who rolled up on a Segway. Inside the hall, attendees streamed into the third-floor conference room and ran to get seats near the front; they were rewarded by meeting Cook and other executives, including design guru Jonny Ive, who pressed the flesh with attendees and lined up to take pictures with them.

A giant Apple icon graced the huge screen on the main stage, while a dozen other screens surrounding the hall were primed and ready to show images from the keynote, alongside banner advertisements cloaked in advance of the announcement. Apple pulled down its online store around 7 a.m. Monday, which it typically does just before a new product announcement.

Apple was grabbing the spotlight Monday for the first time since it announced the iPad Mini in October of 2012, just more than a month after the launch of the iPhone 5. Apple does not typically use the WWDC platform to show off new hardware, however: Because most of the developers focus on constructing apps and other software for Apple devices, the company typically focuses on changes to its platforms and other programs that will more directly affect them.

Last year at WWDC, the company announced an iOS update that included the introduction of Apple Maps, which pushed Google Maps off the iPhone as the standard mapping program. Apple Maps was not ready for prime time when it launched, however, leading to a backlash from confused and lost users that prompted CEO Tim Cook to apologize directly to customers.

Later, Apple shook up its leadership, reportedly as a result of the Maps fiasco. Longtime software chief Scott Forstall left the company, along with the head of the company’s retail arm, and Apple design guru Jony Ive was placed at the top of Apple’s software division. iOS 7, which Apple is expected to show off Monday, is expected to show Ive’s influence and many Apple observers expect a radically different look and feel.

“Software design hasn’t been on the same level as industrial design,” Mark Hall, CEO of Remixation, which makes video-sharing app Showyou, told Bloomberg. “People see this as a chance for the software user interface to get on par with the device design.”

Apple’s iOS-based devices were a spark for a revolution in computing, with the iPhone and iPad taking mobile computing to the masses and putting smartphones and tablets on a path to being more popular than personal computers. Google’s Android operating system has taken advantage of that trend, however, and now is used on more smartphones than Apple, according to companies that track the technology; IDC predicted earlier this year that tablets running Android would overtake the iPad in 2013, as well.

Android’s ascendance has been part of a diminished profile for Apple since the launch of the iPhone 5, especially in the eyes of investors. Apple stock hit an all-time high of more than $700 a share on the day the iPhone 5 launched last September, but has since fallen as much as 45 percent, at times costing the company its title as most valuable in the United States in terms of market capitalization. Apple stock closed Friday at $441.81, and was trading at $448 at the end of Monday’s morning session on Wall Street, at 9 a.m. Pacific time.

Contact Jeremy C. Owens at 408-920-5876; follow him at Twitter.com/mercbizbreak.

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